© National Instruments | 2-7
NI cDAQ-917x User Manual
Routing the Reference Trigger Signal to an Output Terminal
You can route ReferenceTrigger to any output PFI terminal. Reference Trigger is active high by
default.
AI Pause Trigger Signal
You can use the Pause Trigger to pause and resume a measurement acquisition. The internal
sample clock pauses while the external trigger signal is active and resumes when the signal is
inactive. You can program the active level of the pause trigger to be high or low.
Using a Digital Source
To use the Pause Trigger, specify a source and a polarity. The source can be either from PFI or
one of several other internal signals on your cDAQ chassis. Refer to the Device Routing in MAX
topic in the NI-DAQmx Help or the LabVIEW Help for more information.
Using an Analog Source
Some C Series I/O modules can generate a trigger based on an analog signal. In NI-DAQmx, this
is called the Analog Comparison Event.
When you use an analog trigger source, the internal sample clock pauses when the Analog
Comparison Event signal is low and resumes when the signal goes high (or vice versa).
Note Depending on the C Series I/O module capabilities, you may need two
modules to utilize analog triggering.
Note Pause triggers are only sensitive to the level of the source, not the edge.
Getting Started with AI Applications in Software
You can use the cDAQ chassis in the following analog input applications:
• Single-point acquisition
• Finite acquisition
• Continuous acquisition
For more information about programming analog input applications and triggers in software,
refer to the NI-DAQmx Help or the LabVIEW Help for more information.
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